Answer / pradeep

There are so many testing are available to test a power transformer.
1. Turns ration testing : to ensure the no.of turns on each winding.
2. Winding resistance testing: To measure the resistance of each winding.
3. Vector group testing : To identify transformer vector group, which is very important for parallel operation.
4. Insulation resistance testing : To ensure the healthiness of transformer insulation resistance.
5. Impedance voltage testing : Important for parallel operation and loading condition assessment.
6. No load/ Short circuit testing : For the measurement of losses.
7. Partial discharge testing : To monitor the insulation imperfection/aging effect
8. Switching impulse/ lightning impulse testing : To measure the impulse withstand strength of the transformers.
9. Acoustic level measurement: To track the level of magnetic hum of the transformer.
10. Dissolved gas analysis: To identify dissolved gaseous in the transformer gases.
11. Dielectric testing : To measure break down potential of transformer oil.
And the count goes on...!!!
The type of testings carried out will vary based on the application and criticality

Answer / sudhakar g

HI,
Power transformer is used in Switchyards where it can
supply the voltage from grid to grid and the strutcure of
the transformer is Delta to Delta connection. there is no
stepup or step down in that.

I am taking Electrical desining classes in Bangalore...It
will be usefull for designing as well as site engineers
those who are intrested to go for Electrical
Engineers....we give you indepth knowledge of Load calu,
Cable sizing, Lighting cal, panels, breaker
selection,Autocad drawing....if any body intrested means
pls call to +91-7760362623 or sudhakar28485@gmail.com

how we select the fuse and OLR rating for 3 phase induction motor from 1HP TO 100 HP?

2 Answers   Thermax,

---

I AM COMPLETED DIPLOMA IN E.E.E. AS WELL AS B.TECH IN ANDHARPRADESH.. HOW I THE Certificate of competency as Electrical Supervisor.

1 Answers  

---

What is knee point voltage?

0 Answers  

---

What is Single Phasing fault???(not single-phase fault)

6 Answers   ABB,

---

how calculate the current faut level

2 Answers   ABB,

---

suppose generator rating is 50 kw,load is 25 kw,hw much d generator ll generate?what about d remainin power?

2 Answers   NHPC,

---

what is power factor? whether it should be high or low? why?

11 Answers  

---

how to change the load sharing between two synchronized identical alternators when both are running with Diesel engine? assume both are feeding to same feeder?

1 Answers   BARC,

---

what type circuit breaker is suitable for connecting 1000A load VCb,Mccb?

5 Answers   Gridco,

---

What is bushing?

4 Answers  

---

What shall be minimum thickness of firewall in between two transformers and which code specifies it ?

1 Answers  

---

what is raw power & normal power

2 Answers  

---